Update down-the-stack-book/src/the_hal.md

Co-authored-by: Tanks Transfeld <Mirabellensaft@users.noreply.github.com>

down-the-stack-book/src/the_hal.md

@@ -74,7 +74,7 @@ This differs widely across MCUs (ST, Nordic, Espressif, Atmel, etc). Some MCUs (
 ## Correctness by design
 
 * HALs want to make it hard to do the wrong thing
-* Is a UART driver any use, if you haven't configured at least one TX pin and one RX pin?
+* Is a UART driver of any use, if you haven't configured at least one TX pin and one RX pin?
 * Should the UART driver check you've done that?
 
 ---
@@ -93,5 +93,5 @@ let pins =  hal::uarte::Pins {
 let uarte = hal::uarte::Uarte::new(periph.UARTE1, pins, Parity::EXCLUDED, Baudrate::BAUD115200);
 ```
 
-This is example is for the nRF52. We'll use it later in the example.
+This is an example for the nRF52. We'll use it later in the example.